Sure it exports slices for spritestacking. And it's the only software that exports animated slices. Each row is a slice while each column is an animation frame. If you mean a technique used by NIUM game it totally does that.
One last thing i noticed, in an older video featuring and older version of this tool. It was mengtioned that only ~32 colours were avaliabe. Is this so that all the 256^3 colours are not avaliable? If that is the case that is a huge bummer. That really should be a subject of the rework you mengtioned.
And yes, i really am looking into what i am spening my money on before i do (maybe a bit too much, but whatever)